How to operate a thermal deaerator?

This post was last edited by zgj2405 on 2011-12-11 at 14:36; the outlet temperature of the deoxidation tank is controlled based on the steam added

At the beginning, the water inflow is strictly controlled while increasing the steam inlet flow. Once the temperature rises above the desired level, the opening of the water inlet valve is gradually increased (this process takes 1–3 hours). It is also important to monitor the temperature near the deaerator outlet; if the temperature drops, the opening of the steam valve should be increased slightly, and if the temperature continues to rise, the opening of the steam valve should be reduced. This process is repeated until normal operating conditions are achieved

During operation, the deaerator must ensure that the pressure and temperature inside it remain in balance at all times. However, factors such as changes in unit load, inlet water temperature, and fluctuations in the water tank level can affect the stable operation of the deaerator. Thus affecting the deoxygenation effect. Therefore, ensuring the stability of the deaerator’s operating conditions is an important factor in achieving good deoxygenation results. Our experience shows that: 1. Install automatic control devices: such as automatic control of heating steam, automatic control of water inflow, and water level monitoring. 2. Improve the operation mode of make-up water: for example, increase the temperature of make-up water ； Continuously supply water to the deaerator to avoid intermittent deterioration in its operating conditions caused by intermittent water supply. 3. Promptly eliminate abnormal conditions that occur during operation: such as steam discharge containing water ； Vibration ； Issues such as the breakdown of the water seal in the U-shaped overflow pipe help to reduce the phenomenon of steam carrying water: the main reason for this is an excessive amount of steam, which results in a high velocity of the steam and thus the presence of water droplets. In such cases, it is necessary to increase the opening degree of the steam exhaust valve and make appropriate adjustments to reduce or eliminate the presence of water in the steam. Eliminate vibration. Vibration is caused by the impact of water and steam inside the deaerator, and in severe cases, it can affect the connecting pipes, supports, etc. as well. The main cause of soda shock is the low temperature of the incoming water, along with large fluctuations in the water flow rate. In this case, the steam inside the vessel condenses suddenly, causing severe fluctuations in steam pressure, which leads to vapor-water shock and resulting vibrations. Therefore, it is necessary to adjust the inlet water temperature and volume in a timely manner. Of course, the cause of vibration is also directly related to the structure of the deaerator, and some improvements are needed.